摘要
为了解空化性能对微型泵运行可靠性的影响,对两个半开式离心叶轮进行了空化实验。两试验叶轮在断面上具有相同的叶片型线,其中一个为二维叶片,另一个为倾斜叶片。为了与实验对比,在每个叶轮最佳效率点附近,基于标准k-ε模型和VOF空化模型进行微型泵内三维紊流计算。研究揭示了所试验的微型泵具有与常规尺寸离心泵相当的空化性能;随着叶尖轴向间隙增大,微型泵的空化性能下降;对半开式叶轮,采用倾斜叶片,既可提高微型泵的水力性能,还能提高其空化性能。研究显示叶轮进口流动均匀是空化性能得到改善的重要原因。
Cavitation in miniature pumps investigated experimentally for two semi-open centrifugal impellers. Both impellers had the same blade cross-section with one having a two-dimensional blade, while the other had the leaned blade. The flows were also analyzed using a numerical model of the three-dimensional turbulent flow in the pumps near the peak efficiency point using the κ-ω turbulence model and the VOF cavitation model. The average cavitation performance of each impeller was satisfactorily predicted by the numerical simulations. The results also show that the miniature pumps have similar cavitation performances as an ordinary-size pump, with the cavitation performance of the semi-open impeller dropped by increased axial tip clearances and both the hydraulic and cavitation performance of the semi-open impeller improved by the leaned blade. The results also show that uniform flow upstream of the impeller inlet will improve the cavitation.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第8期1451-1454,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(50279012)
关键词
微型泵
半开式离心叶轮
倾斜叶片
进口流动
空化性能
miniature pump
semi-open centrifugal impeller
leanedblade
flow upstream of impeller inlet
cavitation performance
